[ros-users] gazebo materials list

Hi,

One of the parameters of gazebo extension in urdf is "material".
I.e.
  <gazebo reference="centerplate">
         <material>Gazebo/Black</material>
  </gazebo>

Is there an existing list of gazebo materials? In particular, I am looking
for color Beige or Tan, but neither seems available. Thanks for your help.

Grace